Archived posting to the Leica Users Group, 1998/02/17
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On Tue, 17 Feb 1998, Robert Rose wrote:
> I thought one of our more technical minded members might give an opinion on the cause of an interesting "feature" of my Leica lenses.
>
> I have noticed that when shooting available light pictures with my 35mm Summicron-M ASPH, small very bright light sources (almost point sources?) produce a star diffraction pattern on the image, almost like the result from a star filter, in the pattern
of
>
> I have also noticed this with my Vario Elmar-R f/4 35-70.
>
> For example, look at: http://amishalom.org/images/night.jpg
Its diffraction around the edges of the diaphram. Most lenses do this once
stopped down.
Duncan